Datasheet

Pinouts

Power Pins:

Vin - this is the power pin. Since the sensor chip uses 3 VDC, we have included a voltage regulator on board that

will take 3-5VDC and safely convert it down. To power the board, give it the same power as the logic level of

your microcontroller - e.g. for a 5V micro like Arduino, use 5V

3Vo - this is the 3.3V output from the voltage regulator, you can grab up to 100mA from this if you like

GND - common ground for power and logic

SPI Logic pins:

All pins going into the breakout have level shifting circuitry to make them 3-5V logic level safe. Use whatever logic

level is on Vin!

SCK - This is the SPI Clock pin, its an input to the chip

SDO - this is the Serial Data Out / Master In Slave Out pin, for data sent from the MAX31856 to your processor

SDI - this is the Serial Data In / Master Out Slave In pin, for data sent from your processor to the MAX31856

CS - this is the Chip Select pin, drop it low to start an SPI transaction. Its an input to the chip

If you want to connect multiple MAX31856's to one microcontroller, have them share the SDI, SDO and SCK pins. Then

assign each one a unique CS pin.

Additional Pins

There's two more pins that are available for advanced usage

FLT - This is the Fault output. If you use the threshhold-notification capabilities of the MAX31856 you can monitor

this pin, when it goes low there's a fault!